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Semi-Inclusive Reactions (SIR) Workshop 2005

Parton distributions have recently been generalized to describe
the observables accessible in electroproduction with additional
hadron(s) detected in the final state. As a result, two sets of
3-dimensional parton distributions have been introduced: transverse
momentum dependent (TMD) distributions describing semi-inclusive processes;
and Generalized Parton Distributions (GPD) describing exclusive
hard-scattering processes.

We are organizing this workshop in order to bring together
theorists and experimentalists to discuss the details of
nucleon structure that can be probed in semi-inclusive
reactions. We plan to focus on the role of quark orbital angular momentum,
TMD parton distributions, dynamical origins of single-spin
asymmetries and complementarity between partonic description
of hard processes in terms of GPD and TMD.
This approach will augment the presently established role of
semi-inclusive reactions as a tool for flavor separation of
parton distributions, and help identify directions for further
development of this quickly emerging field.